import axios from 'axios'
import { MessageBox, Message } from 'element-ui'
import store from '@/store'
import { getToken } from '@/utils/auth'

// create an axios instance
const service = axios.create({
  baseURL: process.env.VUE_APP_BASE_API, // url = base url + request url
  // withCredentials: true, // send cookies when cross-domain requests
  timeout: 5000 // request timeout
})

// request interceptor
service.interceptors.request.use(
  config => {
    // do something before request is sent

    if (store.getters.token) {//如果有token，则携带上
      // let each request carry token
      // ['X-Token'] is a custom headers key
      // please modify it according to the actual situation
      // getToken()是在@/utils/auth.js中定义的一个函数，可以从cookie中拿到一个键叫vue_admin_template_token的token，那我们是什么时候存到cookie
      //中的呢？在src/store/modules/user.js中的登录函数中先定义const { data } = response，然后setToken(data.token)在cookie中存一个 键
      //叫vue_admin_template_token的token ,到这里，cookie中就存在这个token了并且下边代码将这个token放在了每个请求头中，

      //解释一下const { data } = response：
      //const { data } = response是ES6新写法，代表取出response对象中的data对应的值并将这个新声明的变量名（引用）声明为data，response是
      //Result对象，经过const { data } = response声明后，data变量就代表response中的data，即map集合，所以data.token就说得通了，后端的登录
      //接口生成的token存到map集合中的时候必须键是token，否则这里的data.token就拿不到了(见src/store/modules/user.js)
        
        
      config.headers['X-Token'] = getToken()
    }
    return config
  },
  error => {
    // do something with request error
    //console.log(error) // for debug
    return Promise.reject(error)
  }
)

// response interceptor
service.interceptors.response.use(
  /**
   * If you want to get http information such as headers or status
   * Please return  response => response
  */

  /**
   * Determine the request status by custom code
   * Here is just an example
   * You can also judge the status by HTTP Status Code
   */
  response => {
    const res = response.data


    console.log(response)
    console.log(res)
    // if the custom code is not 20000, it is judged as an error.
    if (res.code !== 20000) {
      Message({
        message: res.message || 'Error',
        type: 'error',
        duration: 5 * 1000
      })

      // 50008: Illegal token; 50012: Other clients logged in; 50014: Token expired;
      if (res.code === 50008 || res.code === 50012 || res.code === 50014) {
        // to re-login
        MessageBox.confirm('You have been logged out, you can cancel to stay on this page, or log in again', 'Confirm logout', {
          confirmButtonText: 'Re-Login',
          cancelButtonText: 'Cancel',
          type: 'warning'
        }).then(() => {
          store.dispatch('user/resetToken').then(() => {
            location.reload()
          })
        })
      }
      return Promise.reject(new Error(res.message || 'Error'))
    } else {
      return res
    }
  },
  error => {
    console.log('err' + error) // for debug
    Message({
      message: error.message,
      type: 'error',
      duration: 5 * 1000
    })
    return Promise.reject(error)
  }
)

export default service
